Enable multicore CUDA compilation

Specify the number of threads to be used for compilation to the CUDA compiler NVCC. Option introduced in NVCC 11.2.

Release OpenCV 4.8.1.

Fix protobuf-host location

OpenCV 4.5.5

Fix protobuf-host location

Merge pull request cpp-pm#4 from ThomasGuerneve/3.4.10-hunterised

3.4.10 hunterised

Merge pull request cpp-pm#2 from inuaimi/hunter-4.2.0

Support for opencv-4.2.0

OpenCV 4.2.0

Merge pull request cpp-pm#1 from kumaakh/hunter-4.1.1

Support for OpenCV4.1.1

OpenCV 4.1.1